edit/editdraw.c

   1 /* editor text drawing.
   2
   3    Copyright (C) 1996, 1997, 1998, 2001, 2002, 2003, 2004, 2005, 2006,
   4    2007 Free Software Foundation, Inc.
   5
   6    Authors: 1996, 1997 Paul Sheer
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.
  22 */
  23
  24 /** \file
  25  *  \brief Source: editor text drawing
  26  *  \author Paul Sheer
  27  *  \date 1996, 1997
  28  */
  29
  30 #include <config.h>
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include <stdarg.h>
  34 #include <sys/types.h>
  35 #include <unistd.h>
  36 #include <string.h>
  37 #include <ctype.h>
  38 #include <errno.h>
  39 #include <sys/stat.h>
  40
  41 #include "../src/global.h"
  42
  43 #include "edit-impl.h"
  44 #include "edit-widget.h"
  45
  46 #define MAX_LINE_LEN 1024
  47
  48 #include "../src/tty/tty.h"             /* tty_printf() */
  49 #include "../src/tty/color.h"
  50 #include "../src/tty/key.h"             /* is_idle() */
  51
  52 #include "../src/widget.h"              /* buttonbar_redraw() */
  53 #include "../src/charsets.h"
  54 #include "../src/strutil.h"             /* utf string functions */
  55 #include "../src/main.h"                /* source_codepage */
  56
  57 /* Text styles */
  58 #define MOD_ABNORMAL            (1 << 8)
  59 #define MOD_BOLD                (1 << 9)
  60 #define MOD_MARKED              (1 << 10)
  61 #define MOD_CURSOR              (1 << 11)
  62 #define MOD_WHITESPACE          (1 << 12)
  63
  64 #define FONT_OFFSET_X 0
  65 #define FONT_OFFSET_Y 0
  66 #define FIXED_FONT 1
  67 #define FONT_PIX_PER_LINE 1
  68 #define FONT_MEAN_WIDTH 1
  69
  70 /* Toggles statusbar draw style */
  71 int simple_statusbar = 0;
  72
  73 static void status_string (WEdit * edit, char *s, int w)
  74 {
  75     char byte_str[16];
  76     unsigned char cur_byte = 0;
  77     unsigned int cur_utf = 0;
  78     int cw = 1;
  79
  80     /*
  81      * If we are at the end of file, print <EOF>,
  82      * otherwise print the current character as is (if printable),
  83      * as decimal and as hex.
  84      */
  85     if (edit->curs1 < edit->last_byte) {
  86         if ( !edit->utf8 ) {
  87             cur_byte = edit_get_byte (edit, edit->curs1);
  88
  89             g_snprintf (byte_str, sizeof (byte_str), "%4d 0x%03X",
  90                         (int) cur_byte,
  91                         (unsigned) cur_byte);
  92         } else {
  93             cur_utf = edit_get_utf (edit, edit->curs1, &cw);
  94             if ( cw > 0 ) {
  95                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
  96                             (unsigned) cur_utf,
  97                             (unsigned) cur_utf);
  98             } else {
  99                 cur_utf = edit_get_byte (edit, edit->curs1);
 100                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 101                             (int) cur_utf,
 102                             (unsigned) cur_utf);
 103             }
 104
 105         }
 106     } else {
 107         strcpy (byte_str, "<EOF>     ");
 108     }
 109
 110     /* The field lengths just prevent the status line from shortening too much */
 111     if (simple_statusbar)
 112         g_snprintf (s, w,
 113                         "[%c%c%c%c] %2ld %3ld/%3ld (%-4ld/%4ldb)= %s  cp:%s",
 114                         edit->mark1 != edit->mark2 ? ( column_highlighting ? 'C' : 'B') : '-',
 115                         edit->modified ? 'M' : '-',
 116                         edit->macro_i < 0 ? '-' : 'R',
 117                         edit->overwrite == 0 ? '-' : 'O',
 118                         edit->curs_col,
 119
 120                         edit->curs_line + 1,
 121                         edit->total_lines + 1,
 122
 123                         edit->curs1,
 124                         edit->last_byte,
 125                         byte_str,
 126
 127 #ifdef HAVE_CHARSET
 128                         source_codepage >= 0 ? get_codepage_id (source_codepage) : ""
 129 #else
 130                         ""
 131 #endif
 132                     );
 133     else
 134         g_snprintf (s, w,
 135                         "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb)= %s  %s",
 136                         edit->mark1 != edit->mark2 ? ( column_highlighting ? 'C' : 'B') : '-',
 137                         edit->modified ? 'M' : '-',
 138                         edit->macro_i < 0 ? '-' : 'R',
 139                         edit->overwrite == 0 ? '-' : 'O',
 140                         edit->curs_col,
 141
 142                         edit->start_line + 1,
 143                         edit->curs_row,
 144                         edit->curs_line + 1,
 145                         edit->total_lines + 1,
 146
 147                         edit->curs1,
 148                         edit->last_byte,
 149                         byte_str,
 150
 151 #ifdef HAVE_CHARSET
 152                         source_codepage >= 0 ? get_codepage_id (source_codepage) : ""
 153 #else
 154                         ""
 155 #endif
 156                     );
 157 }
 158
 159 static inline void
 160 printwstr (const char *s, int len)
 161 {
 162     if (len > 0)
 163         tty_printf ("%-*.*s", len, len, s);
 164 }
 165
 166 /* Draw the status line at the top of the widget. The size of the filename
 167  * field varies depending on the width of the screen and the length of
 168  * the filename. */
 169 void
 170 edit_status (WEdit *edit)
 171 {
 172     const int w = edit->widget.cols;
 173     const size_t status_size = w + 1;
 174     char * const status = g_malloc (status_size);
 175     int status_len;
 176     const char *fname = "";
 177     int fname_len;
 178     const int gap = 3; /* between the filename and the status */
 179     const int right_gap = 2; /* at the right end of the screen */
 180     const int preferred_fname_len = 16;
 181
 182     status_string (edit, status, status_size);
 183     status_len = (int) str_term_width1 (status);
 184
 185     if (edit->filename)
 186         fname = edit->filename;
 187     fname_len = str_term_width1 (fname);
 188     if (fname_len < preferred_fname_len)
 189         fname_len = preferred_fname_len;
 190
 191     if (fname_len + gap + status_len + right_gap >= w) {
 192         if (preferred_fname_len + gap + status_len + right_gap >= w)
 193             fname_len = preferred_fname_len;
 194         else
 195             fname_len = w - (gap + status_len + right_gap);
 196         fname = str_trunc (fname, fname_len);
 197     }
 198
 199     widget_move (edit, 0, 0);
 200     tty_setcolor (SELECTED_COLOR);
 201     printwstr (fname, fname_len + gap);
 202     printwstr (status, w - (fname_len + gap));
 203     tty_setcolor (EDITOR_NORMAL_COLOR);
 204
 205     g_free (status);
 206 }
 207
 208 /* this scrolls the text so that cursor is on the screen */
 209 void edit_scroll_screen_over_cursor (WEdit * edit)
 210 {
 211     int p;
 212     int outby;
 213     int b_extreme, t_extreme, l_extreme, r_extreme;
 214
 215     if (edit->num_widget_lines <= 0 || edit->num_widget_columns <= 0)
 216         return;
 217
 218     r_extreme = EDIT_RIGHT_EXTREME;
 219     l_extreme = EDIT_LEFT_EXTREME;
 220     b_extreme = EDIT_BOTTOM_EXTREME;
 221     t_extreme = EDIT_TOP_EXTREME;
 222     if (edit->found_len) {
 223         b_extreme = max (edit->num_widget_lines / 4, b_extreme);
 224         t_extreme = max (edit->num_widget_lines / 4, t_extreme);
 225     }
 226     if (b_extreme + t_extreme + 1 > edit->num_widget_lines) {
 227         int n;
 228         n = b_extreme + t_extreme;
 229         b_extreme = (b_extreme * (edit->num_widget_lines - 1)) / n;
 230         t_extreme = (t_extreme * (edit->num_widget_lines - 1)) / n;
 231     }
 232     if (l_extreme + r_extreme + 1 > edit->num_widget_columns) {
 233         int n;
 234         n = l_extreme + t_extreme;
 235         l_extreme = (l_extreme * (edit->num_widget_columns - 1)) / n;
 236         r_extreme = (r_extreme * (edit->num_widget_columns - 1)) / n;
 237     }
 238     p = edit_get_col (edit);
 239     edit_update_curs_row (edit);
 240     outby = p + edit->start_col - edit->num_widget_columns + 1 + (r_extreme + edit->found_len);
 241     if (outby > 0)
 242         edit_scroll_right (edit, outby);
 243     outby = l_extreme - p - edit->start_col;
 244     if (outby > 0)
 245         edit_scroll_left (edit, outby);
 246     p = edit->curs_row;
 247     outby = p - edit->num_widget_lines + 1 + b_extreme;
 248     if (outby > 0)
 249         edit_scroll_downward (edit, outby);
 250     outby = t_extreme - p;
 251     if (outby > 0)
 252         edit_scroll_upward (edit, outby);
 253     edit_update_curs_row (edit);
 254 }
 255
 256 #define edit_move(x,y) widget_move(edit, y, x);
 257
 258 struct line_s {
 259     unsigned int ch;
 260     unsigned int style;
 261 };
 262
 263 static void
 264 print_to_widget (WEdit *edit, long row, int start_col, int start_col_real,
 265                  long end_col, struct line_s line[], char *status)
 266 {
 267     struct line_s *p;
 268
 269     int x = start_col_real + EDIT_TEXT_HORIZONTAL_OFFSET;
 270     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 271     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 272     int cols_to_skip = abs (x);
 273     unsigned char str[6 + 1];
 274
 275     tty_setcolor (EDITOR_NORMAL_COLOR);
 276     tty_draw_hline (edit->widget.y + y, edit->widget.x + x1,
 277                     ' ', end_col + 1 - EDIT_TEXT_HORIZONTAL_OFFSET - x1);
 278
 279     if (option_line_state) {
 280         int i;
 281         for (i = 0; i < LINE_STATE_WIDTH; i++)
 282             if (status[i] == '\0')
 283                 status[i] = ' ';
 284
 285         tty_setcolor (LINE_STATE_COLOR);
 286         edit_move (x1 + FONT_OFFSET_X - option_line_state_width, y + FONT_OFFSET_Y);
 287         tty_print_string (status);
 288     }
 289
 290     edit_move (x1 + FONT_OFFSET_X, y + FONT_OFFSET_Y);
 291     p = line;
 292
 293     while (p->ch) {
 294         int style;
 295         unsigned int textchar;
 296         int color;
 297
 298         if (cols_to_skip) {
 299             p++;
 300             cols_to_skip--;
 301             continue;
 302         }
 303
 304         style = p->style & 0xFF00;
 305         textchar = p->ch;
 306         color = p->style >> 16;
 307
 308         if (style & MOD_ABNORMAL) {
 309             /* Non-printable - use black background */
 310             color = 0;
 311         }
 312
 313         if (style & MOD_WHITESPACE) {
 314             if (style & MOD_MARKED) {
 315                 textchar = ' ';
 316                 tty_setcolor (EDITOR_MARKED_COLOR);
 317             } else {
 318 #if 0
 319                 if (color != EDITOR_NORMAL_COLOR) {
 320                     textchar = ' ';
 321                     tty_lowlevel_setcolor (color);
 322                 } else
 323 #endif
 324                     tty_setcolor (EDITOR_WHITESPACE_COLOR);
 325             }
 326         } else {
 327             if (style & MOD_BOLD) {
 328                 tty_setcolor (EDITOR_BOLD_COLOR);
 329             } else if (style & MOD_MARKED) {
 330                 tty_setcolor (EDITOR_MARKED_COLOR);
 331             } else {
 332                 tty_lowlevel_setcolor (color);
 333             }
 334         }
 335         if ( textchar > 255 ) {
 336             int res = g_unichar_to_utf8 (textchar, (char *)str);
 337             if ( res == 0 ) {
 338                 str[0] = '.';
 339                 str[1] = '\0';
 340             } else {
 341                 str[res] = '\0';
 342             }
 343             tty_print_string ((char *) str);
 344         } else {
 345             tty_print_char (textchar);
 346         }
 347         p++;
 348     }
 349 }
 350
 351 int visible_tabs = 1, visible_tws = 1;
 352
 353 /* b is a pointer to the beginning of the line */
 354 static void
 355 edit_draw_this_line (WEdit *edit, long b, long row, long start_col,
 356                      long end_col)
 357 {
 358     struct line_s line[MAX_LINE_LEN];
 359     struct line_s *p = line;
 360
 361     long m1 = 0, m2 = 0, q, c1, c2;
 362     int col, start_col_real;
 363     int cw;
 364     unsigned int c;
 365     int color;
 366     int i;
 367     int utf8lag = 0;
 368     unsigned int cur_line = 0;
 369     char line_stat[LINE_STATE_WIDTH + 1];
 370
 371     edit_get_syntax_color (edit, b - 1, &color);
 372     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 373     start_col_real = (col =
 374                       (int) edit_move_forward3 (edit, b, 0,
 375                                                 q)) + edit->start_col;
 376     c1 = min (edit->column1, edit->column2);
 377     c2 = max (edit->column1, edit->column2);
 378
 379     if ( option_line_state ) {
 380         cur_line = edit->start_line + row;
 381         if ( cur_line <= edit->total_lines ) {
 382             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 383         } else {
 384             memset(line_stat, ' ', LINE_STATE_WIDTH);
 385             line_stat[LINE_STATE_WIDTH] = '\0';
 386         }
 387     }
 388
 389     if (col + 16 > -edit->start_col) {
 390         eval_marks (edit, &m1, &m2);
 391
 392         if (row <= edit->total_lines - edit->start_line) {
 393                 long tws = 0;
 394             if (tty_use_colors () && visible_tws) {
 395                 tws = edit_eol (edit, b);
 396                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' '
 397                                    || c == '\t'))
 398                     tws--;
 399             }
 400
 401             while (col <= end_col - edit->start_col) {
 402                 p->ch = 0;
 403                 p->style = 0;
 404                 if (q == edit->curs1)
 405                     p->style |= MOD_CURSOR;
 406                 if (q >= m1 && q < m2) {
 407                     if (column_highlighting) {
 408                         int x;
 409                         x = edit_move_forward3 (edit, b, 0, q);
 410                         if (x >= c1 && x < c2)
 411                             p->style |= MOD_MARKED;
 412                     } else
 413                         p->style |= MOD_MARKED;
 414                 }
 415                 if (q == edit->bracket)
 416                     p->style |= MOD_BOLD;
 417                 if (q >= edit->found_start
 418                     && q < edit->found_start + edit->found_len)
 419                     p->style |= MOD_BOLD;
 420                 cw = 1;
 421                 if ( !edit->utf8 ) {
 422                     c = edit_get_byte (edit, q);
 423                 } else {
 424                     c = edit_get_utf (edit, q, &cw);
 425                 }
 426                 /* we don't use bg for mc - fg contains both */
 427                 edit_get_syntax_color (edit, q, &color);
 428                 p->style |= color << 16;
 429                 switch (c) {
 430                 case '\n':
 431                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 432                     p->ch = ' ';
 433                     p++;
 434                     break;
 435                 case '\t':
 436                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 437                     col += i;
 438                     if (tty_use_colors() &&
 439                        ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws)) {
 440                         if (p->style & MOD_MARKED)
 441                             c = p->style;
 442                         else
 443                             c = p->style | MOD_WHITESPACE;
 444                         if (i > 2) {
 445                             p->ch = '<';
 446                             p->style = c;
 447                             p++;
 448                             while (--i > 1) {
 449                                 p->ch = '-';
 450                                 p->style = c;
 451                                 p++;
 452                             }
 453                             p->ch = '>';
 454                             p->style = c;
 455                             p++;
 456                         } else if (i > 1) {
 457                             p->ch = '<';
 458                             p->style = c;
 459                             p++;
 460                             p->ch = '>';
 461                             p->style = c;
 462                             p++;
 463                         } else {
 464                             p->ch = '>';
 465                             p->style = c;
 466                             p++;
 467                         }
 468                     } else if (tty_use_colors() && visible_tws && q >= tws && enable_show_tabs_tws) {
 469                         p->ch = '.';
 470                         p->style |= MOD_WHITESPACE;
 471                         c = p->style & ~MOD_CURSOR;
 472                         p++;
 473                         while (--i) {
 474                             p->ch = ' ';
 475                             p->style = c;
 476                             p++;
 477                         }
 478                     } else {
 479                         p->ch |= ' ';
 480                         c = p->style & ~MOD_CURSOR;
 481                         p++;
 482                         while (--i) {
 483                             p->ch = ' ';
 484                             p->style = c;
 485                             p++;
 486                         }
 487                     }
 488                     break;
 489                 case ' ':
 490                     if (tty_use_colors() && visible_tws && q >= tws && enable_show_tabs_tws) {
 491                         p->ch = '.';
 492                         p->style |= MOD_WHITESPACE;
 493                         p++;
 494                         col++;
 495                         break;
 496                     }
 497                     /* fallthrough */
 498                 default:
 499 #ifdef HAVE_CHARSET
 500                     if ( utf8_display ) {
 501                         if ( !edit->utf8 ) {
 502                             c = convert_from_8bit_to_utf_c ((unsigned char) c);
 503                         }
 504                     } else {
 505                         if ( edit->utf8 ) {
 506                             c = convert_from_utf_to_current_c (c);
 507                         } else {
 508 #endif
 509                             c = convert_to_display_c (c);
 510 #ifdef HAVE_CHARSET
 511                         }
 512                     }
 513 #endif
 514                     /* Caret notation for control characters */
 515                     if (c < 32) {
 516                         p->ch = '^';
 517                         p->style = MOD_ABNORMAL;
 518                         p++;
 519                         p->ch = c + 0x40;
 520                         p->style = MOD_ABNORMAL;
 521                         p++;
 522                         col += 2;
 523                         break;
 524                     }
 525                     if (c == 127) {
 526                         p->ch = '^';
 527                         p->style = MOD_ABNORMAL;
 528                         p++;
 529                         p->ch = '?';
 530                         p->style = MOD_ABNORMAL;
 531                         p++;
 532                         col += 2;
 533                         break;
 534                     }
 535 #ifndef HAVE_CHARSET
 536                     int utf8_display = 0;
 537 #endif
 538                     if (!edit->utf8) {
 539                         if ( ( utf8_display && g_unichar_isprint (c) ) ||
 540                              ( utf8_display == 0 && is_printable (c) ) ) {
 541                                 p->ch = c;
 542                                 p++;
 543                         } else {
 544                                 p->ch = '.';
 545                                 p->style = MOD_ABNORMAL;
 546                                 p++;
 547                         }
 548                     } else {
 549                         if ( g_unichar_isprint (c) ) {
 550                             p->ch = c;
 551                             p++;
 552                         } else {
 553                             p->ch = '.';
 554                             p->style = MOD_ABNORMAL;
 555                             p++;
 556                         }
 557                     }
 558                     col++;
 559                     break;
 560                 }
 561                 q++;
 562                 if ( cw > 1) {
 563                   q += cw - 1;
 564                 }
 565             }
 566         }
 567     } else {
 568         start_col_real = start_col = 0;
 569     }
 570     p->ch = 0;
 571
 572     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat);
 573 }
 574
 575 #define key_pending(x) (!is_idle())
 576
 577 static void edit_draw_this_char (WEdit * edit, long curs, long row)
 578 {
 579     int b = edit_bol (edit, curs);
 580     edit_draw_this_line (edit, b, row, 0, edit->num_widget_columns - 1);
 581 }
 582
 583 /* cursor must be in screen for other than REDRAW_PAGE passed in force */
 584 static void
 585 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row,
 586                   long end_column)
 587 {
 588     long row = 0, curs_row;
 589     static int prev_curs_row = 0;
 590     static long prev_curs = 0;
 591
 592     int force = edit->force;
 593     long b;
 594
 595 /*
 596  * If the position of the page has not moved then we can draw the cursor
 597  * character only.  This will prevent line flicker when using arrow keys.
 598  */
 599     if ((!(force & REDRAW_CHAR_ONLY)) || (force & REDRAW_PAGE)) {
 600         if (!(force & REDRAW_IN_BOUNDS)) {      /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 601             start_row = 0;
 602             end_row = edit->num_widget_lines - 1;
 603             start_column = 0;
 604             end_column = edit->num_widget_columns - 1;
 605         }
 606         if (force & REDRAW_PAGE) {
 607             row = start_row;
 608             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 609             while (row <= end_row) {
 610                 if (key_pending (edit))
 611                     goto exit_render;
 612                 edit_draw_this_line (edit, b, row, start_column, end_column);
 613                 b = edit_move_forward (edit, b, 1, 0);
 614                 row++;
 615             }
 616         } else {
 617             curs_row = edit->curs_row;
 618
 619             if (force & REDRAW_BEFORE_CURSOR) {
 620                 if (start_row < curs_row) {
 621                     long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 622                     row = start_row;
 623                     b = edit->start_display;
 624                     while (row <= upto) {
 625                         if (key_pending (edit))
 626                             goto exit_render;
 627                         edit_draw_this_line (edit, b, row, start_column, end_column);
 628                         b = edit_move_forward (edit, b, 1, 0);
 629                     }
 630                 }
 631             }
 632 /*          if (force & REDRAW_LINE)          ---> default */
 633             b = edit_bol (edit, edit->curs1);
 634             if (curs_row >= start_row && curs_row <= end_row) {
 635                 if (key_pending (edit))
 636                     goto exit_render;
 637                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 638             }
 639             if (force & REDRAW_AFTER_CURSOR) {
 640                 if (end_row > curs_row) {
 641                     row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 642                     b = edit_move_forward (edit, b, 1, 0);
 643                     while (row <= end_row) {
 644                         if (key_pending (edit))
 645                             goto exit_render;
 646                         edit_draw_this_line (edit, b, row, start_column, end_column);
 647                         b = edit_move_forward (edit, b, 1, 0);
 648                         row++;
 649                     }
 650                 }
 651             }
 652             if (force & REDRAW_LINE_ABOVE && curs_row >= 1) {
 653                 row = curs_row - 1;
 654                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 655                 if (row >= start_row && row <= end_row) {
 656                     if (key_pending (edit))
 657                         goto exit_render;
 658                     edit_draw_this_line (edit, b, row, start_column, end_column);
 659                 }
 660             }
 661             if (force & REDRAW_LINE_BELOW && row < edit->num_widget_lines - 1) {
 662                 row = curs_row + 1;
 663                 b = edit_bol (edit, edit->curs1);
 664                 b = edit_move_forward (edit, b, 1, 0);
 665                 if (row >= start_row && row <= end_row) {
 666                     if (key_pending (edit))
 667                         goto exit_render;
 668                     edit_draw_this_line (edit, b, row, start_column, end_column);
 669                 }
 670             }
 671         }
 672     } else {
 673         if (prev_curs_row < edit->curs_row) {   /* with the new text highlighting, we must draw from the top down */
 674             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 675             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 676         } else {
 677             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 678             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 679         }
 680     }
 681
 682     edit->force = 0;
 683
 684     prev_curs_row = edit->curs_row;
 685     prev_curs = edit->curs1;
 686
 687   exit_render:
 688     edit->screen_modified = 0;
 689     return;
 690 }
 691
 692 static void
 693 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 694 {
 695     if (page)                   /* if it was an expose event, 'page' would be set */
 696         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 697
 698     if (edit->force & REDRAW_COMPLETELY)
 699         buttonbar_redraw (edit->widget.parent);
 700     render_edit_text (edit, row_start, col_start, row_end, col_end);
 701     /*
 702      * edit->force != 0 means a key was pending and the redraw
 703      * was halted, so next time we must redraw everything in case stuff
 704      * was left undrawn from a previous key press.
 705      */
 706     if (edit->force)
 707         edit->force |= REDRAW_PAGE;
 708 }
 709
 710 void edit_render_keypress (WEdit * edit)
 711 {
 712     edit_render (edit, 0, 0, 0, 0, 0);
 713 }